Vacuum pump



April 8 E9246 1,489,57 3

K. G.- SOMMER VACUUM PUMP Filed Feb. 2, 1920 2 Sheets-Sheet 1 April 8 192%n 1,49,793

K. G. SOMMER VACUUM PUMP Filed Feb. 2, 1920 2 Sheets-Sheet 3 EB W 69 Karl .Efinmmer' awue/wbo z Patented Apr. 8, 192%.

a489, T FlC L G. SUMMER, OF BATTLE CREEK, MICHIGAN.

' VACUUM PUMP.

Application filed February 2, 1920. Serial No. 355,819.

To all whom it may concern:

Be it known that T, KARL G. SOMMER, a citizen of the United States, residing at Battle Creek, in the county of Calhoun and State of Michigan, have invented certain new and useful Improvements in Vacuum Pumps, of which the following is a specification.

This invention relates to improvements in vacuum pumps particularly well adapted for use in heating systems.

The primary object of this invention is the provision of an effective vacuum pump, which is used in connection with heating systems for creation of a suitable vacuum within a heating system vby expelling air from the heating system in an advantageous manner.

A further object of this invention is the provision of an improved vacuum pump of the rotary type utilizing vanes, embodying an improved means for maintaining an air tight connection between the vanes and the surfaces over which they operate.

A further object of this invention is the provision of an improved compact arrange ment of details of a vacuum pump construction.

Other objects and advantages will be apparent during the course of the following detailed description.

In the accompanying drawings, forming a part of this specification, and wherein similar reference characters designate corresponding parts throughout the several views:

Figure 1 .is a longitudinal cross sectional view, taken through the improved vacuum pump structure, showing certain novel details thereof- Figure 2 is a transverse cross sectional view, taken substantially on the line 2-2 of Fi re 1.

igure 3 is a perspective view of a novel type of crank shaft which may be used as a novel detail of the improved pump structure.

The improved vacuum pump structure 36 may include a housing section 66 and a removable end. section 70. The section 66 of the pump structure 36 preferably provides a cylindrical operating chamber 71 within which a rotor 72 is eccentrically mounted. The rotor '72 preferably is so mounted within the chamber 71 that the outer periphery thereof has sliding contact with a point on the inner periphery of the chamber 71, thus providing a barrier between the inlet and outlet openings communicating with the chamber 71, as will to at one side thereof is preferably keyed to 655v a drive shaft 42, the drive shaft 42 having an enlarged head 74 formed upon its inner end which extends into the chamber of the rotor 72 and engages the same to prevent relative longitudinal movement of the shaft and rotor. The opposite hub extension 75 aligns with the hub extension 73 and is rotat-ably mounted over. a bearing sleeve 76. The bearing sleeve 76 is preferably provided at its outer end with a disc 75 77 which is clamped against the outer side of the housing section 70 by means of a clamping cap 7 9. Suitable bushings 80 may be mounted in the bearings or 'ournal ends of the housing sections 66 and 0, and

within which bushings the sleeve extensions 73and 75 may rotate, as is clearly shown in Figure 1 of the drawings The rotor 72 is preferably provided with sleeve like bearings 81 formed inwardly of 5 the outer periphery thereof, transversely thereof, and at diametrically opposed points, and which are adapted for rotatably receiving bearing sleeves 82 therein. The bearing sleeves are transversely slotted, and-are adapted for radially receiving vanes 83 and 84 in sliding manner therein. The vanes 83 and 84 are of novel formation, and at their inner ends are provided with sleeves 86 and 87 respectively; which are of less width than the width of the vanes upon which they are positioned, so that said sleeves 86 and 87 when placed in alignment edge to edge will provide a combined sleeve structure which is substantially of the same width as the width of either of the vanes. The vanes 83 and 84 are mounted in rotatable manner upon an offset or stub crank portion 88 of a crank shaft 89. The crank shaft 89 is provided with a mounting extension 90 which is received within the sleeve 76 of the housing section 70, and is keyed to said sleeve 76 so that the same may not rotate with respect to the vacuum pump housing. The opposite end of the mounting 1w portion 90 is preferably providedwith a reduced screw threaded end 91, winch may receive a nut 92, by means of which the crank shaft 89 may be effectively clamped against longitudinal movement within the housing section 70. From this, it can be seen that the eccentric stub portion 88 eecentrically extends into the chamber of the rotor 72, substantially as is illustrated in Figure 2 of the drawings. The sleeve portions 86 and 87 of the vanes 83 and 84 are of course rotatably mounted upon the eccentric portion 88 of the crank shaft 89, said vanes extending for sliding bearing within the oscillatively mounted sleeves 82. The vanes 8 and84 are thus diametrically opposed. The outerends of the vanes 83 and 81 are preferably laterally enlarged, by flaring, as is illustrated at 85.

From the foregoing description of the construction of the pump, it is obvious that as the drive shaft 12 rotatesthc rotor 72, the vanes 83 and 84 will be rotated about the eccentrically positioned end 88 of the stationary shaft 89, so that the vanes will extend radially through the rotor 72 and be moved within the chamber 71 of the housing 36 to effect'a purpose which will be subsequently described. An air inlet pipe 35 is preferably connected to inlet extension 93 formed rigid as a part of the pump structure 86; a suitable strainer 94 preferably being disposed between the pipe 35 and coupling or extension 93 to prevent sediment or foreign material from entering the housing chamber 71. The extension 93 has com.- munication with the chamber 71 through a plurality of openings 9.7, which are gradually constricted at the entrance thereof.

into the chamber 71. An outlet pipe 37 is provided, having connection with the chamber 71 through an extension 96 formed upon the housing 36. Openings 97, altogether similar to the openings 95 are provided at v the outlet end of the pump structure, which are of tapering formation, gradually decreasing in size toward their communication with the chamber 71, and as clearl shown in Figure 2 of'the drawings. s illustrated in Figure 2 of the drawings, the rotor 72 forms a barrier between the inlet and outlet openings 95 and 97; said inlet and outlet openings being proximately disposed with respect to the contact point of the rotor 72 with the inner circumferential periphery of the chamber 71.

During rotation of the rotor 72, the vanes 83 and 84 will be gradually extended from the rotor as they pass the barrier point hetween the inlet and outlet openings, the

rotor 72 having a direction of rotation from the outlet opening toward the inlet opening, substantially as is illustrated by the arrow in Figure 2 of the drawings. As the rotor 72 moves about the axis of the drive shaft 42,the uppermost vane as it passes the inlet opening will be gradually extended so that area of the chamber 71. between the barrier point provided by the rotor 72 and the vane which has just passed the inlet opening will be gradually enlarged, creating a suction which will draw air into the chamber 71 through the inlet openings.

The position of the vanes 83 and 8 1 as illustrated in Figure 2 of the drawings subdivides the effective area of the chamber 71 into compartments 98 and 99, which are respectively known as the intake and exhaust compartments.

Referring to the novel means for providing sealed connections between the parts of the rotor and vanes which move within the housing 36, an opening 100 may preferably be provided, having an outlet at the barrier in the chamber 71 at which the rotor 72 slid-ably contacts, and into which opening or duct 100 a pipe 101 of small diameter communicates. This pipe 101 is adapted to convey water or. the like into the opening 100, so that the same may discharge a small quantity of water at the barrier point between the rotor and pump housing to form 'a water film or seal within the chamber 71,

providing an air tight barrier or partition between the inlet and outlet openings. This film is spread about the inner periphery or circumference of the compartment 71, and cooperates with the laterally flared edges 85 of the vanes 83 and 84; in providingair tight connections between said vanes and the inner circumference of the chamber 71 over which they operate.

A suitable drain duct 102 may be provided in the flared ortion of the housing 106, being tangentia ly arranged therein to permit draining of water from the compartment 71. A plug 103 will normally operate within 105 the duct 102.

From the foregoing description of this invention, it is apparent that a vacuum pump has been provided, the parts of which may be compactly arranged. The structure has been essentially designed for use as "a vacuum pump, and in this connection rotor and Vane cooperating parts are of prime importance. That the water seal will provide air tight connections is also important, as the pump is primarily adapted for use in creating a vacuum in connection with heatin systems as above mentioned.

arious changes in the shape, size and arrangement of parts may be made to the form of invention herein shown and de-' scribed, without departing from the spirit of the invention or the scope of the claims.

I claim 2- I 1. In a turbine vacuum pump structure, 12! the combination of a casing provided with a circular chamber, an operating shaft extending into said chamber, a rotoreccentrically mounted within said chamber includlng an annular outer wall, side walls, and 13 outwardly extending bearing sleeves, means rigidl securing one of said sleeves to the operating shaft, a rigid sleeve secured to the casing and fitted within the other sleeve of the rotor for supporting the rotor, a crank shaft rigidl secured to the rigid sleeve and having a crank arm eccentrically extending into said chamber. a plurality of vanes roftlttlllly mounted upon said crank arm of the shaft, vane carrying sleeves rotatahl' v carried by said rotor, said vanes extending through the rotor and having; their outer ends in surface cont-act with the inner wall of the chamber. said vanes proiei-ting through the rotor at diametrically opposed points. whereby (hiring rotation of the rotor one ol the vanes will he creating an air inletchamher for drawing air into the circular chan'iher while the other is forcing air from the chamber.

:2. A rotary vacuum pump comprising a casing formed of a body section having a chamber therein, and an end wall section, said body section and end wall section having aligning openings which extend eccentrically with respect to the chamber of the casing, a cylindrical shaped rotor eccentrically mounted Within the chamber of the casing having, outwardly extending sleeves at the sides thereto which rotat-ah-ly bear in the bearing openings of the casing, a drive shaft keyed to one of the sleeves of said rotor having an enlarged end which extends into the chamber of said rotor to pre vent relative movement of the drive shaft and rotor, a stationary crank including a portion r .\"tendin; through the other sleeve of said rotor, a hearing intermediate said portion of the crank and the sleeve within which it is disposed, means connecting the said hearing to said casing, said crank shaft having a floating crank end which extends into the chamher of said rotor, and vanes oscillatively mounted on the floating end of said stationary crank shaft having slidable extensions through said rotor, said rotor having sliding contact between inlet and outlet openings which are provided in the casing.

KARL G. SOMMER. 

